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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9c5371af6849607c3e59eedbe13d5ea3881ee71bdb6920c6fb40e7ed8789c4' 
  AND token = 'HyxQpHF7kmN5Yk43F1quWflNs5iT/Z5RNQysi4+17Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}